What is the best way to sync some cards across boards?

We have a Trello business account with multiple boards for each of our teams or projects, and an executive view board for our leadership team to have insight into what the teams are working on. I am trying to figure out the best way to sync a few cards from our team and project boards to the executive board so we don't have duplicate cards on multiple boards and so team members don't have to add updates on the same project on multiple cards. I tried doing this with the Unito Board Sync power up and set a filter to only sync cards with that filter from a team board to the executive board, but what happened was all other cards got cleared off the executive board - the only ones on the board were the ones synced with Unito from the team board and not cards that had been manually added to the board. Is there any way to pick and choose SPECIFIC cards from our team boards to get synced to the executive board?